HJCMOONB SW280-165 DC Contactor DC48V User Manual

Product Overview

The HJCMOONB SW280-165 DC Contactor is an electrical switching device designed for high current DC applications. It features a normally open contact type and is rated for DC48V systems. This contactor is suitable for various industrial and scientific applications requiring reliable power switching.

Image: Front view of the HJCMOONB SW280-165 DC Contactor, showing its terminals and housing.

Specifications

Feature	Value
Product Number	SW280
Contact Type	Normally open
Coil Rated Voltage (DC V)	6V, 12V, 24V, 36V, 48V, 60V, 72V, 84V, 120V, 150V, 220V (etc.)
Contact Rated Voltage (DC V)	≤80V
Contact 48V Circuit Rated Load Current (DC-1)	350A
Main Contact Voltage Drop (100A load)	≤80mV
Pull-in Action Voltage (20±5°C cooling)	≤70%
Release Action Voltage (20±5°C cooling)	≤35% ≥5%
40°C Coil Working Voltage Range	0.8-1.2Us
Power-on Action Time	50 milliseconds
Power-off Release Time	10 milliseconds
Contact Connection Max Bounce Time	10 milliseconds
Contact Opening Max Bounce Time	3 milliseconds
Insulation Resistance	20MΩ
Dielectric Strength	50Hz/60Hz 1000VAC 1 minute
Max Switching Capacity (5ms, 48V DC)	1500A
Coil Power Consumption	13-30W
Coil Temperature Rise	≤85K
Lead-out Terminal Temperature Rise	≤65K
Electrical Life	20,000 times
Mechanical Life	300,000 times
Working Specification	Continuous or intermittent
Contact Material	AgCdO
Load Terminal Type	M10 screw
Coil Terminal Type	6.3mm
Auxiliary Contact Rated Load (optional)	2A/48VDC, 5A/24VDC
Auxiliary Contact Type (optional)	One normally open and one normally closed

Safety Information

Before installation or operation, read and understand all safety warnings and instructions. Failure to do so may result in electric shock, fire, or serious injury.

Ensure power is disconnected before working with the contactor.
Installation should be performed by qualified personnel only.
Verify correct voltage and current ratings for your application.
Do not exceed the specified maximum switching capacity.
Protect the contactor from moisture and extreme temperatures.

Setup and Installation

Proper installation is crucial for the safe and reliable operation of the SW280-165 DC Contactor.

Mounting

Choose a stable, vibration-free location for mounting.
Ensure adequate ventilation around the contactor to prevent overheating.
Mount the contactor securely using appropriate fasteners.

Wiring

Load Terminals: Connect the main DC load circuit to the M10 screw terminals. Ensure proper polarity.
Coil Terminals: Connect the control voltage (e.g., 48V DC) to the 6.3mm coil terminals. Observe polarity if specified for the coil.
Auxiliary Contacts (Optional): If auxiliary contacts are present, connect them according to your control circuit requirements. These typically include one normally open and one normally closed contact.
Use appropriately sized wiring for the expected current to prevent overheating.
Tighten all terminal connections securely to prevent loose contacts and arcing.

Operating Instructions

The SW280-165 DC Contactor operates by energizing its coil to close the main contacts, thereby connecting the load circuit.

Initial Check: After installation, double-check all wiring connections for correctness and security.
Apply Control Voltage: Apply the rated DC control voltage (e.g., 48V DC) to the coil terminals. The contactor should audibly click as the main contacts close.
Verify Load Connection: Confirm that the load circuit is now energized.
De-energize: Remove the control voltage from the coil terminals. The contactor should audibly click as the main contacts open, disconnecting the load circuit.
Continuous/Intermittent Operation: The contactor is designed for both continuous and intermittent operation within its specified ratings.

Maintenance

Regular maintenance helps ensure the longevity and reliable performance of your DC contactor.

Periodic Inspection: Visually inspect the contactor and its connections periodically for any signs of wear, damage, or overheating (discoloration).
Terminal Tightness: Check and re-tighten all terminal screws as necessary, especially after initial operation and during routine maintenance. Loose connections can cause arcing and premature failure.
Cleaning: Keep the contactor free from dust, dirt, and debris. Use a dry, soft cloth for cleaning. Do not use solvents or abrasive cleaners.
Contact Wear: While the contacts are designed for a long electrical life (20,000 operations), excessive arcing or frequent switching of high inductive loads can accelerate wear. If excessive pitting or erosion is observed on the main contacts (only visible upon disassembly, which should be done by qualified personnel), consider replacement.

Troubleshooting

This section provides solutions to common issues encountered with the SW280-165 DC Contactor.

Problem	Possible Cause	Solution
Contactor does not pull in (no click)	No control voltage to coil Incorrect coil voltage Open circuit in coil wiring Damaged coil	Check control power supply and wiring. Verify control voltage matches coil rating (e.g., 48V DC). Inspect coil wiring for breaks or loose connections. Test coil resistance; replace contactor if coil is open.
Contactor pulls in but load does not energize	Loose main contact wiring Damaged main contacts Load circuit fault	Tighten M10 screw terminals. Inspect contacts for severe pitting or welding; replace contactor if damaged. Check load circuit for open circuits or faults.
Contactor overheats	Overcurrent condition Loose terminal connections Insufficient ventilation Incorrect coil voltage (too high)	Verify load current is within contactor's rating (350A for 48V DC). Tighten all terminal connections. Ensure adequate airflow around the contactor. Check coil voltage; ensure it is within 0.8-1.2Us range.

Warranty and Support

For warranty information or technical support regarding your HJCMOONB SW280-165 DC Contactor, please contact your supplier or the manufacturer directly.

Please have your product model number (SW280-165) and purchase details available when contacting support.